A public health medicine specialist with the HSE has attributed a four-fold increase in the incidence of HIV in men aged between 25 and 34 years as due to a lack of awareness about the importance of prevention of HIV and other sexually transmitted diseases.
Dr Derval Igoe said it was important to send out a message of positive sexual health to all gay men and to others.
Dr Igoe said she would encourage those who had had unprotected sex to get tested for HIV and other STDs.
She said: "There are new generations of people coming along who may not have been aware of the importance of prevention of HIV and other STDs.
"We need to keep sending the message out and sending the message of positive sexual health for all people including gay men, and that there are plenty of services there. For example testing is free."